A concave mirror produces three times magnified real image of an object placed at 7 cm in front of it. Where is the image located? (21 cm in front of the mirror).

Explanation

Given : `hi = 3h_o`
`u = 7 cm`
Solution:
(i) `m = (h_i)/(h_o) rArr (3ho)/(h_o) therefore m =3`.
(ii) `m = - (v)/(u)`
` v = -m xx u`
`= -3 xx 7 cm = -21 cm`.
Hence, Real, inverted and magnified image will be formed at 21 cm in front of the mirror.